Logical Comparisons And Lnequalities - Sharp PC-1500 Instruction Manual

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Input
Display
( ( 6 - 4)
I
21
* ( ( (
3 - 1l/ 4) *6)
f EHTEstl
3
The equations
' 1 ,Vi thin
the innermost set of parentheses will ah'Y'ays be calculated first .
R EMEMBER: When in doubt. use parentheses to clari fy the o rder of your arithmetic operations.
G. LOGICAL COMPARISONS AND INEQUALITIES
SHARP If.Jill
an-0 ..
~1
you to
cornparc
t .. -.io
values o r equat ions and .,,..,ill indicate to you the result of
the cornparison. This ability is basic to designing programs which make decisions. T he manner in
\vh ich this is do11e ,_.,ill be recognizable t o students of the "New Math" as an inequal ity (don't
despair
if
you ~·,.1c rcn ' t raised on Nei.-v Math; the au thor \' > "asn't either).
An inequality may be thought o f as a com parison w hich is ei ther t n.re or false. For instance,
the statement "six divided by th ree is equal to l\vo" is a cornpa rison .. 'lh ich happens t o be t ru e.
On the other hand . the statement, "six divided by t h ree is greate r than f ive" is a false comparison.
Computers a nd mathematicians u se the fol lowing symbols for the possible types o f corn·
par isons:
<
less than
>
greate r than
~
equal to
< =
less than OR e(1ual to
> =
greate r t han 0 R equal to
< >
not equal to
Thu s, we can restate the above inequalities symbol ically, as: 6
I
3
=
2 and 6
I
3
>
5 respec·
t ively.
Given an inequalit y, Sl-IA RP .. viii determ ine v1hethcr the comparison is t rue o r false . In
keep ing w ith current computer design pract ice. SHARP w ill indicate a t rue staternent \vith a
1
and
a fa l$e 11a1eme111 w ilh a 0. For example if you type :
6 / 3 = 2
SHA RP w ill rc-spond \vith a
1
t for true). T ypin g the sequence:
6 / 3
>
5
w ill elicit a response of 0 (for false).
T ry the following tests of SHARP's judgment (be sure you a re in RUN model :
18
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